/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.solr.search.function;

import org.apache.lucene.search.Searcher;

import java.io.IOException;
import java.util.Map;

/**
 * A function with a single argument
 */
public abstract class SingleFunction extends ValueSource {
	protected final ValueSource source;

	public SingleFunction(ValueSource source) {
		this.source = source;
	}

	protected abstract String name();

	@Override
	public String description() {
		return name() + '(' + source.description() + ')';
	}

	@Override
	public int hashCode() {
		return source.hashCode() + name().hashCode();
	}

	@Override
	public boolean equals(Object o) {
		if (this.getClass() != o.getClass())
			return false;
		SingleFunction other = (SingleFunction) o;
		return this.name().equals(other.name())
				&& this.source.equals(other.source);
	}

	@Override
	public void createWeight(Map context, Searcher searcher) throws IOException {
		source.createWeight(context, searcher);
	}
}